FTIR analysis of well-defined α-Fe2O3 particles

Yinsheng Wang, Atsushi Muramatsu, Tadao Sugimoto

Research output: Contribution to journalArticlepeer-review

135 Citations (Scopus)

Abstract

The FTIR spectra of well-defined hematite (α-Fe2O3) particles varying in size, shape and internal structure have systematically been analyzed. It has been found that the absorption peak frequencies of the pseudocubic particles are located between the corresponding theoretical peak frequencies of spheres and cubes and shift to lower frequencies as particle size increases, corresponding approximately with the Mie theory. However, the basic spectrum pattern was determined by the morphology of the particles. The observation of ellipsoids with various aspect ratios revealed some essential discrepancies in the peak frequency between experiment and the theory on the surface phonon modes in small particles, even if the particles were completely dispersed in the medium. The internal structure mainly affects the peak width, which increases with the decreasing subcrystal size. Finally, the effects of aggregation on the IR spectrum are discussed.

Original languageEnglish
Pages (from-to)281-297
Number of pages17
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume134
Issue number3
DOIs
Publication statusPublished - 1998 Mar 31

Keywords

  • Hematite
  • Infrared spectrum
  • Internal structure
  • Shape
  • Size

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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